LP3988IMFX-2.6 National Semiconductor, LP3988IMFX-2.6 Datasheet

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LP3988IMFX-2.6

Manufacturer Part Number
LP3988IMFX-2.6
Description
Manufacturer
National Semiconductor
Datasheet
© 2004 National Semiconductor Corporation
LP3988
Micropower, 150mA Ultra Low-Dropout CMOS Voltage
Regulator With Power Good
General Description
The LP3988 is a 150mA low dropout regulator designed
specially to meet requirements of Portable battery-
applications. The LP3988 is designed to work with a space
saving, small 1µF ceramic capacitor. The LP3988 features
an Error Flag output that indicates a faulty output condition.
The LP3988’s performance is optimized for battery powered
systems to deliver low noise, extremely low dropout voltage
and low quiescent current. Regulator ground current in-
creases only slightly in dropout, further prolonging the bat-
tery life.
Power supply rejection is better than 60 dB at low frequen-
cies and starts to roll off at 10 kHz. High power supply
rejection is maintained down to lower input voltage levels
common to battery operated circuits.
The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 150 mA,
from a 2.5V to 6V input, consuming less than 1 µA in disable
mode and has fast turn-on time less than 200µs.
The LP3988 is available 5 pin SOT-23 package and 5 bump
thin micro SMD package. Performance is specified for −40˚C
to +125˚C temperature range and is available in 1.85, 2.5,
2.6, 2.85, 3.0 and 3.3V output voltages.
Key Specifications
n 2.5 to 6.0V input range
n 150mA guaranteed output
Typical Application Circuit
DS200205
n 40dB PSRR at 10kHz
n ≤1 µA quiescent current when shut down
n Fast Turn-On time: 100 µs (typ.)
n 80 mV typ dropout with 150mA load
n −40 to +125˚C junction temperature range for operation
n 1.85V, 2.5V, 2.6V, 2.85V, 3.0V, and 3.3V
Features
n 5 bump thin micro SMD package
n SOT-23-5 package
n Power-good flag output
n Logic controlled enable
n Stable with ceramic and high quality tantalum capacitors
n Fast turn-on
n Thermal shutdown and short-circuit current limit
Applications
n CDMA cellular handsets
n Wideband CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
n Tiny 3.3V
±
20020502
5% to 2.85V, 150mA converter
www.national.com
August 2004

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LP3988IMFX-2.6 Summary of contents

Page 1

... Key Specifications n 2.5 to 6.0V input range n 150mA guaranteed output Typical Application Circuit © 2004 National Semiconductor Corporation n 40dB PSRR at 10kHz n ≤1 µA quiescent current when shut down n Fast Turn-On time: 100 µs (typ typ dropout with 150mA load n − ...

Page 2

Block Diagram Pin Descriptions Name V EN GND V OUT V IN Power Good Connection Diagrams SOT-23-5 Package (MF) Top View See NS Package Number MF05A www.national.com micro SMD SOT A1 3 Enable Input Logic, Enable High B2 2 Common ...

Page 3

... STD SOT23-5 Package LP3988 Supplied as 1000 LP3988 Supplied as 3000 Units, Tape and Reel Units, Tape and Reel LP3988IMF-2.5 LP3988IMFX-2.5 LP3988IMF-2.6 LP3988IMFX-2.6 LP3988IMF-2.85 LP3988IMFX-2.85 LP3988IMF-3.0 LP3988IMFX-3.0 LP3988IMF-3.3 LP3988IMFX-3.3 5 Bump Thin Micro SMD Package LP3988 Supplied as 250 Units, Tape and Reel LP3988ITL-1.85 LP3988ITL-2 ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications PowerGood(applies OUT EN only to micro SMD) Junction Temperature Storage Temperature Lead Temp, Pad Temp. Power Dissipation (Note 3) SOT23-5 micro SMD Electrical Characteristics Unless otherwise specified ...

Page 5

Electrical Characteristics Unless otherwise specified 1.8V appearing in standard typeface are for T range for operation, −40˚C to +125˚C. (Note 6) (Note 7) Symbol Parameter V Logic Low Input threshold IL V Logic High Input threshold ...

Page 6

FIGURE 2. Line Transient response Input Perturbation Typical Performance Characteristics = V + 0.2V 25˚C, Enable pin is tied to V OUT A Ripple Rejection Ratio (LP3988-2.6) www.national.com 20020522 FIGURE 1. Power Good Flag Timing 20020508 FIGURE 3. ...

Page 7

Typical Performance Characteristics V + 0.2V 25˚C, Enable pin is tied to V OUT A Power-Good Response Time (LP3988-2.85) (flag pin pulled to V through a 100KΩ resistor) OUT Power-Good Response Time (LP3988-2.85) (flag pin pulled to V ...

Page 8

Typical Performance Characteristics V + 0.2V 25˚C, Enable pin is tied to V OUT A Enable Response Load Transient Response www.national.com Unless otherwise specified (Continued) IN 20020518 Load Transient Response 20020520 ...

Page 9

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, the LP3988 requires external capacitors for regulator stability. The LP3988 is specifically designed for portable applications requiring minimum board space and smallest components. These capacitors must be correctly selected for good performance. ...

Page 10

Physical Dimensions unless otherwise noted www.national.com inches (millimeters) 5-Lead Small Outline Package (MF) NS Package Number MF05A Thin micro SMD, 5 bump Package (TLA05) NS Package Number TLA05AEA The dimensions for X1, X2 and X3 are as given ...

Page 11

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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